Multiple dial control



Oct. 5 1926.

H. R- BARTLETT MULTIPLE DIAL CONTROL Filed March 8, 1926 INVENTOR HEN/Q YR 8/1 I 7L5 QM W4 W ATTORNEY Patented 0st. 5, 1923.

UNETEE STATES HENRY R. BARTLETT, OF PITTSFIELD, MASSACHUSETTS.

MULTIPLE DIAL CONTROL,

Application filed March 8, 1926.

The invention relates to a multiple dial control to n'ovide means to control a plurality of tuning elements in a radio receiver, and also to provide means to transmit power to a plurality of tuning elements from an intern'iediate dial.

A further object of the invention is to provide means whereby a plurality of tunmg elements of a radio receiver may be operated together or separately, regardless of whether or not the tuning elements consist of coils or condensers, or whether or notv inafter set forth and pointed out in the claims.

in the drawings accompanying and forming a part of this specification Figure 1 is an elevation view showing the multiple dial control affixed to a radio panel above the tuning elements.

Figure 2 is an elevation view showing the multiple dial control afiixed to a radio panel below the tuning elements.

Figure 8 is aplan view of the multiple dial control.

Figure t is a sectional view of the multiple dial control to show the device more clearly.

Figure 5 is a side view of the multiple dial control in contact with the tuning elements.

In the drawings, 12 represents a radio panel to which is attached the tuning elements 14, and located intermediate the tuning elements is a multiple dial control as shown in Figures 1 and 2. It will be seen by referring to the drawings that the multiple dial control may be placed above or below the tuning elements and produce the same effective results.

The multiple dial control proper consists of a sheaved disk 11 with a groove 15 passing entirely around the perimeter of the sheavec disk. A stud 3, provided with a shoulder 4, is threaded into the disk 11, and

Serial No. 93,337.

the thread of the stud is such that the stud will come flush with the under side of the sheaved disk 11, so as to allow the sheaved disk to turn freely without interfering with the panel 12.

A knob 1, for operating the sheaved disk 11, is attached to the upper part of the stud S by means of the set screw 2. An adjustment arm 5, which is preferably constructed from a tube, is crushed on itself at the inner end, and provided with a hole so that the stud 3 may freely pass through it. A washer'9 is placed under the adjust-- ment arm 5, and is for the purpose of allowing clearance for the sheaved disk 11 to ro-- tate and not interfere with the adjustment arm 5. The adjustment arm 5 is provided at the outer end with a slot 13, which slot passes through both sides of the arm. A. casing 7 is provided with a hole and is slidably placed over the adjustment arm. A coil spring 6 is inserted inside of the adj ustmentarm and held in position by means of the screw 8, which screw passes through the hole in the casing 7 and the slot 13 in the adjustment arm. The screw 8, aside from holding the casing 7 and the spring 6 in place, provided the means whereby the multiple dial control is attached to the panel 12. A. washer 10 is placed under the adjustment arm 5 and the casing 7 to provide a support for the adjustment arm against the panel 12.

The operation of the device is as follows:

The sheaved disk 11 is placed snugly against the tuning elements 14;, and the said tuning elements fit into the groove 15 on the sheaved disk 11. The multiple dial control is then attached to the panel 12 by means of the screw 8. The coil spring 6 being under pressure against the screw 8 will cause the sheaved disk 1.]. to be held in position against the rim of the tuning elements 14. The screw 8, by means of the slot 13 in the adjustment arm 5, can be so placed on the panel 12 to regulate the pressure of the multiple dial control against the tuning elements 14:, as the casing 7 is free to slide on the adjustment arm 5. The degree of pressure of the multiple dial control against the tuning elements can always be regulated by means of the coil spring 6.

An operation of the knob 1 will cause the sheaved disk 11 to rotate, and the motion will be imparted to the tuning elements and also cause them to rotate in multiple. It

will also be seen, by referring to the drawings, that a downward or upward pressure, Which pressure depends on the location of the multiple dial control, will disconnect the multiple dial control from the tuning elements and either tuning element may be operated independently of the other by turning the knob on the tuning element.

What I claim is 1. A multiple dial control comprising a sheaved disk held in contact with a plurality of tuning elements and rotating therewith, an adjustment arm extending from the center of the said disk, a stud extending from the said disk and attached thereto, said stud passing through tle adjustment arm and tree to rotate therein, a knob attached to said stud, a coil spring encased Within the adjustment arm, a casing slidably placed over the outer end of the adjustment arm, means to hold the said coil spring and casing in position and affix the multiple dial control to a radio panel.

2. A. multiple dial control comprising a sheared disk held in contact with a plurality of tuning elements and rotating therewith, an adjustment arm extending from the center of the said disk, said adjustment arm flattened on the inner end and provided With a hole for the passage of a stud, said adjustment arm provided with a longitudinal slot on the outer end, a stud ex tending from the sheaved disk passing through the adjustment arm and free to rotare therein, a knob attached to saie stud, a coil spring encased Within the adjustment arm, a casing slidably placed over the outer end of the adjustment arm, said casing provided with a hole to receive fastening means, means to hold the said coil spring and casing in position and afiiX the multiple dial control to a radio panel.

In testimony whereof I aftix my signature.

HENRY R. BARTLETT. 

